Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '779fddcfa76fc320e0e1eb9e039d673dcf0e0c4df27f0708c952fe5817e39453' 
  AND token = 'yMrXVHk5OJfI81MkzWQHgzQsLLjvcIVlPOEHXcnigbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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