Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9b2efe4a07138cea4576bf46ab5bc37e4d5c469dce773ebdcbfdd7d42889dd' 
  AND token = 'uax161GP9lNHpdu9JzLKe6JFOG5ZNc3MXlQDiizM6Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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