Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e18bac033e88f0ff9bc00c2bc23658f649bb90e2d315ab8fd80c9499e9be937' 
  AND token = 'HbyeLx6sJLJfQ7eip2Rqmb3aCAf4GQUklsI6Da//Tg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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