Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd38240516f2a3f39360309917087df577f5f0e79253e5520ad84ee4f8bd548ec' 
  AND token = 'n4jL7qCHHaHCmD9nmYd5l9qEeeIsGtuTkIjOV+WscP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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