Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebecc30e3bb0ba7e51e465dd92fbb648463c98d5e7d1c1d263111f3d3c4d376f' 
  AND token = '9Yj4g9l/9NB2OeDdKDIgHXwCDZvWob88Zy3wgBgYRjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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