Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb379ff36d02b2f6cdadc8cb7d66f847c99ea742cb8b205a453fa659109ac9bb' 
  AND token = '6Vi6amGG3ct2uVorMPy6hYBxU94bzCAIPI5/ppWZfyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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