Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574584e54213c6ee997124ba080127b156491cbde6dd5c5e676dbf423830d391' 
  AND token = '0ohDviv149O1sE3EJOSpZAsyPdNb3bXSqI0hVK0Vr3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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