Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e48ee9a2bdcacdd2a8d917478e9d26177cba71e217c9d61ffb8e9a03e8023c' 
  AND token = 'Mt5WDeTG5WSMYBKeAhB82MQv5oBNyrSsDElmzls3NgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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