cache: handle time skip / cache fetch on newer queries

lib/cache.c

@@ -89,7 +89,7 @@ int kr_cache_query(namedb_txn_t *txn, knot_rrset_t *rr, uint32_t *timestamp)
 		rr->rrs.data = found_rr->data;
 
 		/* No time constraint */
-		if (timestamp == NULL) {
+		if (timestamp == NULL || *timestamp < found_rr->timestamp) {
 			return KNOT_EOK;
 		}