Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6938ff41c7619d13b7c16aa41c51f78a4daed8c3bf7ea2f3c15ea7ac9eadad14' 
  AND token = 'trppZY2Rpy2mWWEak/ufVEhEjenGeTM/IFX3ZNfyW+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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