Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7730ab88d902bab6c5f48b0417cb29ffd36db799d2273be847a97d4f8908c1' 
  AND token = 'HRW2lnKZkfZ7sSHReHcd9uYLiKdc8qTfvoLMqPMpLRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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