SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bfaec216c7f7bd9a46f2b799e9250961d8231cda264c3ef2f8e4cd73dbfadcca' 
  AND token = 'vzBlKE3+A9qZ/Lu18SoFWKtO6OfpUG1R5H8bzPicu0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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