Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46bc84c468d3bcee8a833372995c45990111d22e62f181553bacb62456418fd1' 
  AND token = 'zxZNZcRzzeE3Ybz8UncfXv75Fltk4cMcAsM4e7EovAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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