Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c71e7f314208ecd720ae36a76c69262ec9e8fdace474e632c399f0d1ba69e4c' 
  AND token = 'fJK1fwUVvECEiZQ17KXxVMNr5AlS0YJu7MuwzVdB6j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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