diff --git a/resources/sql/autopatches/20150605.feed.index.sql b/resources/sql/autopatches/20150605.feed.index.sql
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20150605.feed.index.sql
@@ -0,0 +1,2 @@
+ALTER TABLE {$NAMESPACE}_feed.feed_storynotification
+  ADD INDEX key_object (primaryObjectPHID);
diff --git a/src/applications/notification/storage/PhabricatorFeedStoryNotification.php b/src/applications/notification/storage/PhabricatorFeedStoryNotification.php
--- a/src/applications/notification/storage/PhabricatorFeedStoryNotification.php
+++ b/src/applications/notification/storage/PhabricatorFeedStoryNotification.php
@@ -25,6 +25,9 @@
         'userPHID_2' => array(
           'columns' => array('userPHID', 'hasViewed', 'primaryObjectPHID'),
         ),
+        'key_object' => array(
+          'columns' => array('primaryObjectPHID'),
+        ),
       ),
     ) + parent::getConfiguration();
   }