$conn = new PDO(DB_DSN, DB_USERNAME, DB_PASSWORD);
$sql = "SELECT * FROM users WHERE username = :username AND password = :password LIMIT 1";

foreach $conn->query($sql) as $row) {
    echo $row['token'];
}

/*results:
Warning: Invalid argument supplied for foreach() in C:\xampp\htdocs\kundeservice\classes\class.users.php on line 77
*/