Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d1f59775af9f1e7182fcda52ea23e81e49b21b33b1c0eda0e7f760677fba45' 
  AND token = 'BXFgvTWfXvXYcfjCOTDNZKsiopbM4EjWgaMEQphkNTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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