jia_isu_uuidにインデックスが貼られていない

毎回全部レコード読み込んでいるのでまずいです

MariaDB [isucondition]> select * from isu_condition limit 1;
+----+--------------------------------------+---------------------+------------+----------------------------------------------------+-----------------------------+----------------------------+
| id | jia_isu_uuid                         | timestamp           | is_sitting | condition                                          | message                     | created_at                 |
+----+--------------------------------------+---------------------+------------+----------------------------------------------------+-----------------------------+----------------------------+
|  1 | eb104b95-3532-4828-8550-89da717b9667 | 2021-06-03 15:59:09 |          1 | is_dirty=false,is_overweight=false,is_broken=false | わ、わるくないね！          | 2021-06-03 15:59:09.000000 |
+----+--------------------------------------+---------------------+------------+----------------------------------------------------+-----------------------------+----------------------------+
1 row in set (0.000 sec)

MariaDB [isucondition]> explain SELECT * FROM `isu_condition` WHERE `jia_isu_uuid` = '8beaa485-8fbb-4f86-a1d0-2770a16000b2' ORDER BY `timestamp` DESC LIMIT 1\G;
*************************** 1. row ***************************
           id: 1
  select_type: SIMPLE
        table: isu_condition
         type: ALL
possible_keys: NULL
          key: NULL
      key_len: NULL
          ref: NULL
         rows: 46693
        Extra: Using where; Using filesort
1 row in set (0.000 sec)

txxxxc / isucon11-qualify

jia_isu_uuidにインデックスが貼られていない #3