diff --git a/sa/db-next/boulder_sa/20251002000000_AddRevokedSerialsIndex.sql b/sa/db-next/boulder_sa/20251002000000_AddRevokedSerialsIndex.sql
new file mode 100644
index 00000000000..44815cc4edf
--- /dev/null
+++ b/sa/db-next/boulder_sa/20251002000000_AddRevokedSerialsIndex.sql
@@ -0,0 +1,9 @@
+-- +migrate Up
+-- SQL in section 'Up' is executed when this migration is applied
+
+ALTER TABLE `revokedCertificates` ADD KEY `serial` (`serial`);
+
+-- +migrate Down
+-- SQL section 'Down' is executed when this migration is rolled back
+
+ALTER TABLE `revokedCertificates` DROP KEY `serial`;