Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b9a8df154ea45f529f07649502aa9b978fba0193774ee465b36d80a2eb3ee0' 
  AND token = 'DQlhN59V3rkhLrQCuN2V9D/1sDTS7kQ71yN34GH47Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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