Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '501d3f68a1bdf0a7cfd04368a1c75b4d7c27f0014812c32b4e8d1a43ffc8d0fc' 
  AND token = 'LhWIzqJNX/N7cj5bLykE74ZDpj4sIsdJY85Y0TsjJmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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