Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6d9bc3c5363822909342d23a712fed3fa0f72b33ed041f64e4c60fb1b53a32' 
  AND token = 'kRX9H5fr7o1HOUqM8VuzbPf+JXMderhPepUqAUfXXrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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