SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6e55a5ed9590005316fec26b258a4f4819302956dfecbbdd74728b70bdf7f0ad' 
  AND token = 'nTwo2Go2RN9YoNxZ9fh+pSKiqI9lL/2BLLwmVXI2lYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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