Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57cf0d8f4c58d7bb8b2c44172f3c5750b1e5decbaa94927d7e47daa5340e08c9' 
  AND token = 'l9hmvc9cA6Ns4qPxI6ffK8KZDkLgCuPFF5OEOdikTcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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