Very need, touch methode

The "touch" command is used to update the expiration time of an existing item
without fetching it.

touch <key> <exptime> [noreply]\r\n

- <key> is the key of the item the client wishes the server to delete

- <exptime> is expiration time. Works the same as with the update commands
  (set/add/etc). This replaces the existing expiration time. If an existing
  item were to expire in 10 seconds, but then was touched with an
  expiration time of "20", the item would then expire in 20 seconds.