Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c469dd372165c17810643932f6afb93f227e5f11e14369695697d8fde98215' 
  AND token = 'pNCMfSrvH/ggpSKCFbOL5aoeotCiXwRhwFzbikHg9SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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