Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a409b4a78bf4139cdca9d1b075d5bc5c297c931496123ff77fa77f8a21c53ba' 
  AND token = 'LQs4X5awzoS0oRHy44bLuh/cImxXFA885YCCWvvNPm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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