No, a sandwich won't last a week, especially without refrigeration. Anything like mayo is the first to go. Hard cheese by itself will last that long, but not next to other things. A plain scrambled egg will be good for the day without keeping it cold, and anything you add to it to make it become an omelet will make it spoil quicker.
You're expecting too much from oxygen absorbers. They do not preserve foods that contain moisture that you would normally keep in the refrigerator. They prolong the shelf life of foods that oxidise from exposure to air, like grains and dry pasta. Sorry, but a sandwich is that day's food.
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How to preserve sandwich as trail food?
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