Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be9e52bf0be6514e040095839ae63caec67ab6704f5be25d7e5761f8cebc7e5' 
  AND token = 'ARgwN8j0UjPk+rHbrGikU0Vf/rCt/y8PzT7VHXskOi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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