Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb843b78c3c0bd52d7cf01d780d0059135756baf3d3ea2feecdc5528d98e50d' 
  AND token = '/7vmhU1cmTXq/4zCHwIfBhnYoVOSkaVQb2RrCFUDQEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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