Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad4f9e8cc90c42474a39ba8b5c80579bc8cf0465c5a63a7fd6676bd8d49f451' 
  AND token = 'TS44gQvRjfaS6PgRHfreZhQ8Jdh7djYA31IV0prjYs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}