Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3e97d85fca30beb260c7c8a936703ba984aa5653e3e9541c2456a0a16535a06a' 
  AND token = 'WMUN4YNUoB+m3w1YNScNjeh1TgWK55vde5vQ/YKAZwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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