code: def get_tokens(self):
          
          tokens_snapshot = self.db.prefixed_db(NotificationPrefix.PREFIX_TOKEN).snapshot()
          results = []
          for val in tokens_snapshot.iterator(include_key=False):
              event = SmartContractEvent.FromByteArray(val)
              results.append(event)
          return results
docs: Looks up all tokens
          Returns:
              list: A list of smart contract events with contracts that are NEP5 Tokens