Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74dd6e9df71cf1d324641baf3b816ed7ddbf6a2d19fe73d5b90f9ab07ef337df' 
  AND token = 'AUFXo4zcv7UBSAa3ZQGbk6YzVhuYrUj8QlcFCpi1Sss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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