Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234c4bbaa3f0f7763b84678fb0b860d84b2362ff46d2a348b0f4e6d0ba297080' 
  AND token = 'BpkTcDxH7LxmJcti/+qPY1BfHUV1kTmLhEjtjsRVhjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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