Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cfa3376771937bcc96c5a462722a7ad7b1b1bae4d797e50c698475df4ecf923' 
  AND token = 'bh2t2Qx2ssU8up+2WXgx3ZBrsw2TRTtReE5GPdn6k9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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