Which time contains the jockery of isaac murphy as well as the winner of kingman?
CREATE TABLE "kentucky_derby_winners" (
  "year" text,
  "winner" text,
  "jockey" text,
  "trainer" text,
  "owner" text,
  "time" text
);
SELECT "time" FROM "kentucky_derby_winners" WHERE "jockey"='isaac murphy' AND "winner"='kingman';