Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a293ee704e3e48689a64b26735cdfc550ebd188a1a8a8fa705e79a540b453a1' 
  AND token = 'z5+qWFsB1NhKBlJynzAdjBzrhMi6Izd/i+ycgj1M3fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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