SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0562fc463fe4dfb6375741d02fd597c47aeacf8ec78f2142077465b84c449edc' 
  AND token = '2A3gQA/lC1JUm25CNoJ50Y6xLfj+wvFn6wq7rM3vUVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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