Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe5039997bbd0d84bc1482ecf1f912e6a547b2ab5e0202d5ece38e3d3d9d3ff' 
  AND token = 'uz5V6F5Jt9B/67Stknakj9RHmkBthaLE5aDa/6l1vdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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