Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760fa6ab42623f29f902e098788bd20227195c3691977ff04313ec9e2f882316' 
  AND token = 'tTQn9Gn8RWnA560QajuMdXjWvR6fZGDqEfmRDaDRXCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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