The book is not a composite/collective work such that Stephen King's copyright notice applies to the cover.
Furthermore, even if a copyright notice inside the book applies to the cover art, King is not the name of the proprietor of the cover nor a name by which the proprietor is generally known. King is neither an assignee of the cover nor a licensee such that his copyright notice shields the proprietor from forfeiture. Thus the cover art is published without a copyright notice and is hence in the public domain.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
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