Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c0124f6aa1118ad70562c899f2c5bf592630100b3621e3dc95d7e014b049a1' 
  AND token = 'LHx9G0pzHnFAPD+7YYBv6xJl5fG5ZN3Wz1e6hIRxuZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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