Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688b7fe01d23fe3c6bb469932866c448e95ff9d0538ef166e0b6559329c9b044' 
  AND token = '+8e/yQdWh91mqjRWyT0FxsFVPZ51GYd03e+B9IXINFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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