Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584046068eb2f5c58a9d46e6545afa6ebc0984db24b7a156352d58ba08c65cc9' 
  AND token = '8oCn8D4aS/4qiUKPa8eWs+m/+8k5TRMT485tGdkD4kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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