SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a34f48ce4bc780c5dc3b10243410512ae4fc671bfc4acc27a5391bd91cd18b8c' 
  AND token = '/wfsE5afWnCH/T2kECIXLO6+umsgVPYrT7ihF0t1+Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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