SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '073e9ba80b5a30a10282ab7f2ba99de5af568468f94772b40e314600ed7a7868' 
  AND token = 'PD+tLBtrTIJeI+V9QEgWnLCv8DOazgFmKBN8Apg8NkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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