Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99947bd472aa91e98887fc8f28b6f4c2ff7d80f53dd8de262868c8534169c4a9' 
  AND token = 'wiNIgaUrbZ2Uy8Mcy1x2M6Vs3ncU+P319lhDz94MUk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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