Notwithstanding the requirements of this subsection, a deferred annuity contract may provide that if no considerations have been received under a contract for a period of two full years and the portion of the paid-up annuity benefit at maturity on the plan stipulated in the contract arising from prior considerations paid would be less than twenty dollars monthly, the company may at its option terminate the contract by payment in cash of the then present value of the portion of the paid-up annuity benefit, calculated on the basis on the mortality table, if any, and interest rate specified in the contract for determining the paid-up annuity benefit, and by this payment shall be relieved of any further obligation under the contract.
§ 376.669, RSMo