Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f66b6ffeaa6704434fe9b7b4983998d9d11232a8c503e0bc926a376fa8659ba' 
  AND token = 'VPOI81nx+rsf3L77SZo5Ljl4kz5Mb/l1v7FLWtmHAww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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