Laravel eloquent taking 6-12 seconds to return results

I have this data I'm trying to pull, but I have a lot of rows in the DB so it can take 12 secs to return results. Any ideas on how to improve performance?

  $completedActivities = Activity::where('executed_at', '>', Carbon::now()->subDays(14))
        ->where('pending', false)
        ->where('user_id', auth()->user()->id)
        ->orderby('executed_at', 'desc')
        ->limit(100)->get();

I tried pulling only items from last 14 days (to reduce pulling all activities from db) and tried limiting to 100. any other ideas? refactor maybe?

via Chebli Mohamed