Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd520956c4f124784e97499f4915fda984497ad759204587ee6f60144e14c9560' 
  AND token = 'v3O6ovJqCumvBXPKwKCp/iXLe9qBeI8duv6PxbcsRPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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