Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7204491482eaa4d8def12852035e9da32dfc58728fb73cb4011911a9f53de7c7' 
  AND token = '694PlYVFcEBRL4trhsaRg0KANLD5Ckbd32ZwXgO8W00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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