SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8dfffab971a8480d2237c79794fd93e608a1b4e0106d6de345ac80855086985b' 
  AND token = '0ZVwRFVQ1kxQSaH7JTxbZ6RewwkTGjouH9ZiaY7Buvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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