Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ee6b445c537ee4598e5a349e316e38a4c6b69508ed067472ff4661f0906f55' 
  AND token = '7qEIoe+IhDiaAfHFy3tOep+uSZmGgYG5NX6sQ+XCHf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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