Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4c9193122b836de2d7ce250bd3d044953bf9d8b52a1bb31b1f5a73e5b3b5f1' 
  AND token = 'qapv7UMENMvJNf1fRtUG7CMJgOxJHtFTA+zKOtV8Egc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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