Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40f8c77ec341e4180cb4b96d1fdc85728d9169aa374c80abb66a4e319acd407' 
  AND token = 'ttCItsD3Hqf1cwLXJteDd55eTk6c+/d0y1XPhwFll2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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