Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9845b7d0cc1c6a9c056f16469f0b687476b9b39be5d9146e3b5441b0352a16' 
  AND token = 'tqhkVDONpMJzdUp1VPWOn3gFfHgqsysHrkWfBuZ0eEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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