SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a66f4eefe2936fbd7e998bf7b42edda308bf217d22481dc22f7456e5df0c08fb' 
  AND token = 'Qm3qhtAvLXpGPnD8b9n7aNC115JSb5fRPsYPl+KNBas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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