Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ad3d4ebff68269383f90300609f71fd79cfe0ee6788ed3c908a9392c21d9f40' 
  AND token = 'SMLjeZXhWpMf8BM5y+w9SQImjsa34npq4dI70kJ65kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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