Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e897c420cb6fda66246465f5e2487df602a758b2bbf5c3d2bbc999bbf70f7c52' 
  AND token = 'nZH2V3Xa6BOlXkoaJL5zGldOwr4tcbDjDlKiLAO7QRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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