请教，laravel分组后怎么获取到最新的一条

有个观看记录表，执行 select `video_id` as `id`, `time`, `is_over`, `created_at` from `video_watch_record` where `user_id` = 95 group by `video_id` order by `created_at` desc;获取到的总是相同video_id的最旧的一条，
$record = VideoWatchRecordModel::where('user_id',$user_id)
->select(['video_id as id','time','is_over','created_at'])
->orderBy('created_at','DESC')
->groupBy('video_id')
->get();