Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6a44e73dcaffad58bcefa3f97894f2c26b1d2d75c61fc7b52a064510d94352' 
  AND token = 'yVmAGu3sYlstYSgcm7sXPkrGAymQ5Sv9hQktsUaRsrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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