Plain flour has a very long shelf life, especially if it was stored in a cool and dry place away from direct sunlight. Since white flour does not contain the germ part of the wheat kernel, it lacks the oils that typically go rancid quickly in whole wheat alternatives. If your bag was tightly sealed and shows no signs of moisture, mold, or pantry pests like flour beetles, it should be safe to use for your homemade wraps.
The main issue with flour that is over a year old is not safety, but a potential drop in quality. Over time, flour can lose some of its natural aroma and subtle flavor, which might result in a slightly flat taste, but it will still bind and cook properly. Before using it for your lunch recipe, I recommend giving it a thorough visual check and passing it through a fine-mesh sieve to aerate it and remove any tiny lumps that may have formed during storage.