Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2788f4e7af0594701ece8b13f27a2adcf6f36a8612ea3ab86b4cbeffdc5b6ea6' 
  AND token = 'QJ1ABUKKrlTTZ61BcC3zDbL6A7yiYCHiWdqyBy+tfvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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