There wouldn't be significant traffic at that hour. The major mapping websites will give you an estimate based on historical traffic data if you enter a date and time. Using Bing, I'm getting 24 minutes for travel time for a randomly selected Monday in February:
wo
Link to Bing Maps:
https://binged.it/2ntzErO
For the map, I selected a random spot inside the Magic Kingdom parking lot. Keep in mind, if you're making the trip soon, there is a ton of road work being done on the Magic Kingdom toll plaza area. I don't think it would impact you more than a couple of minutes, however.
Growing up, I had a mentor that taught me that being on time meant arriving a few minutes early for any appointment. If I were in your shoes, I would feel very comfortable leaving the Universal area at 6:30am for your dining time.