Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6692d734d57bce9659b3a405e46e3fc3f8b3f11aa75b36a8a4f71ecc3175dda' 
  AND token = 'CIyoLWiTkk4Gk93TCxe84u02OmsaBSi0KQMVmqoOFrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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