SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '84454efa06c9f6864efa3741bf06c03f181d91b619f7389d1f5e1cedd242b5d7' 
  AND token = 'ZVdUKCvaH1gMjaHFmPijNhbtY3l+EdB3k0Krrxdjjcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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