Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '549f9fc6447c0d775ee8acdd703978cb883afd45ea43ad81b2f3c8af7e313d95' 
  AND token = 'A2+qEzmUa2zV71bsYuMRq3fzZHG2NQ1ihfXKCtL1g4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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