Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2f14b5bdcecd45f4e0e644d6f8b7b03385de820a6c3588d0845b713f565d53' 
  AND token = 'cNo5YjYoOSuZsMqvzFPOyPsq553Gac7JfgS97mFr7D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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