Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e8c9c8ac83da38f195cf7a570022fa707b5e1c57b8ef4fc6bc0998bca8c396' 
  AND token = 'r8fFjRPUiDJnWW8BS84At5Sdkrl6K4mAF0IO7tq+dwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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