Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9adaface87ef0c5111e7527bdb84cf022333df9bb8972a9a967d8f1f0ed019c3' 
  AND token = 'VTJsWzCsaRi0ca83VAy+JBB6MpCbeokUzSk7XzH6eq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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