SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '09f27a7c0db3b52a7db213d8477d3c12c55ae7fb38448c36e0236661b086e5fa' 
  AND token = 'qcBeAsY4oETwPnolljf1y/hPVGNjydIm+dNBLnCnsAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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