Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3ad0c3109778ae6365f82cd401f97b76064e714e6b1e18101a6aee5a0b4bc8' 
  AND token = 'EcHSd9g7AuX3TsKKxx2qZTsTrmQgjeI3K5L5J5bgUMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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