Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b2bcc4174c87eaeae88cd8ac96f34d9ad4c2952bd2363b4007189fa2b5e4d3' 
  AND token = 'IZtRk+QIkwbWUiWAO47ytzgY+8sOtLbJdmWsf3Wgg6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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