Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fd3412817e5fc3f8d4ae678d7fabf3a9a594cd7d2a32c287244bc33eecf5e628' 
  AND token = 'ZasCzBU4t4lyjioAxm+XBIxAymodxTyLGGYBk+7Nps4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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