Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a423dc6c879c2d0e9ddc4e9a8f0dbd9889fe1a0c0687a77e402e0642e38fd3ea' 
  AND token = 'e98teqeO1W9J5RGkfrdbHP9nGbDMZjwE14kfmw+5XH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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