Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '641da252b700b0e94630832e7661aa1b435fc79d0e74490c0e86a7aeefd76094' 
  AND token = 'dg6fh2jdy3LHzb3d3qnPmWITn/Ql5KePlhAB9q0YCdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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