Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a347a8e3035193ae3131c8ec2fda630bb85d77ad787b8cca8894b1f8f9cce2' 
  AND token = 'BlOfVEfuRM0WoMVz4rjic9uD12Q494wimMb3LVmeXVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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