Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ea5a2cd6a5e5e10d3e1ac4ab97ce8d3cfc9e04e2afb026ee3e6f7d1480bd03' 
  AND token = 'RxNgrn6yIbVnRmfzaX5RYGwy6UQ6VELNUO/nortT5Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}