Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12db863b1bec9c0ce750f276d6d743ff81d69fbb0e7ff725409aeae8c59f11a3' 
  AND token = 'pbFsHep6ei8BQfHTj9NHMvdpbtTgM4NNzoWdsTWUHwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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