Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4519b722f841b39bc015809d8d7ed152e3a94dfdf0be77efdc0f75e3650638f' 
  AND token = 'y40K5+aQsO9bFUjsTVmhdFL82YZH65gDsktFvm+0wg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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