Okla. Const. Schedule, § 30
Any person who shall have been a resident of the territory within the limits of the State for a period of one year next preceding the date on which the election for the ratification of the Constitution is held, and who shall otherwise be eligible, under the provisions of this Constitution, to be elected to any State office, shall be eligible to be elected to any such State office at the first election held for the election of State officers.