Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7636c25e3c738595fb9a50ecb9a71ad2c08b016ca09de6b8b7ee68d98b6866f4' 
  AND token = 'nHXIq6L4SQ75v4BHWOZmzbf08ipWGVKqN12w0RPD5Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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