Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e58518ff11487284287487b8caf899fe7c41a1fc37777b4af3544045f4ad19' 
  AND token = 'uF6YKm8mjBx9YVCsmBHwVodvuRJcc6MELWE7aI508Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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