Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f22fcae72926efa6cfa945544dc8bef0cb3b9fa9cbd8aa5b72fe17e7a0fcc8' 
  AND token = 'WyD680Xz8IsLpEGljxknAwKboFBszkiThjkLilOYbf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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