Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c023d3dfbb88e13d4f1785fcedac2c54d60bb7c18878ba0200173b1f65bf820b' 
  AND token = 'pEAc2RgOhfYk2YNa3g9jVD8/6TOjhfx580+qWEkFGPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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