Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9db9013cd8a6237a542a67fb833afec12a280f3be4cb3a656516d2e2e5efd9' 
  AND token = '1ZDDZiT9T16V+Rg+uAVVcXKizKNNkzBbfWxYuC4tFt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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