Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704b466dcd9bbe6f751d354b0a4137c056bb6bee8cecbd109e01e5a64a757a7f' 
  AND token = 'cQNyh6i4UQLAM8QlY6bW3ouk9qbTCsCezAYFcM7ZOcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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