Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b5643ad13d1eb5f9d20d65569b87bea7b9788a708764aa91f9bffd76fe1307' 
  AND token = 'CmqYsU+ad4qz6cfe8xDGNG7LcktePUyOk+KiM2aW8LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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