Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17cae52c1f0e004d459f092ef9fe763eb229999179917a0c3d8c243a7f0ffff' 
  AND token = '0vu/UnT10UM5sEvucLflMR/bXVoFHAwdnF5OdbotIzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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