Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b53a10097e40c5e8c64a0f62af3e92bb5650a73efddff7de7c4ca1b9b0e73329' 
  AND token = 'QLJfi0rzHMgmXObGWuJY0A3lDcNLlQDzkNLN/QhSa50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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