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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ae30690fedf0b886c0f67caced97fdb8cc4e392ce3d85ac0b2c5d4b59f49283b' 
  AND token = '4on288l1J5BlbUG1al5/foZH5fuZqU8BiTqDH/dqEqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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