Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f81642eaeefc645b73cd0413c981495f9cf13ed6da9edd3638f75320e469c76' 
  AND token = 'xLe2tlpemx0f+ecu45prtihspVpO+dVPmbJs5HrQsjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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