Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae939fe4f7637568030542f503742dbf0740bbfaaf0a4feb997d981ceaf8ea2' 
  AND token = 'gX7wbAq7j4lAHhFD7k2NXQFs+Jn1NSCiMAa5gV5Bd7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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