SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8ca71a2b30b0c5a7223cfa12f3132ed06fc22213add28cc120b9cc552bd9f9bc' 
  AND token = 'q2BZ9qjKfgd3+5krKPOVJlCRdWZXKuoYnalM/pfhv50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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