Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4e89d0224a7df76e7a8dfca32528bdb650aa28a73a2087fc4f07582f3da836' 
  AND token = '6+ClSVCFVo7rqJ8Kfifema1w7VYPtDLCSOo9V016Kzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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