Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d6f02ff6870a3911706501eeebb570e6bf729dc5161ec05947e32c48394161' 
  AND token = '50oLpKRT+h08mcKL/VqbhezvQocIm0b9UqXQ//91yM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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