SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd013eab3318fa372f507199c75c650589db51ae16d449afc8c9d1ec783829ec3' 
  AND token = 'UzuWg6Bn5thr2YjGwH852vuIfbm4ORp1DaUgyXU4v4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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