Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9b115f9a65e94e2b315fd9fd452c0299bf839ab9bbec377ceed68dc468df67' 
  AND token = 'IH2T/thbenmvQLz9q63lxuTkqEH091IY3Vy5MVfkZBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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