Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2d5407ccdeed6b2d967a890057d90f30d86b95a2ee14883b95ce75a73a031f' 
  AND token = '2gO+cixuwh9KWmZ7FJlf9i2wQoYwmHkC/sA1TT8UAlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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