Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81623c497c6d3ad9f1630fc7f9294e2e9ed9dd0c331eec006504f1b832b9fb43' 
  AND token = 'KWsGaFt1gQLvbYkIUs8BUv6tdJMrU3TbKVJ9N+UEOqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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