Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f47779f462fcd6573727b53ef42238cba7464e9df329e1e032a6f4aaf0a7e9e5' 
  AND token = 'FZk5jLirdwn7X6/AnFj6rEoFvTaIg3/tHqYDhlo8jSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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