Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068d8c44e065b7c1d6eda10f8b203d634b99948d4aee2c18b6202f44ebf58a1c' 
  AND token = 'FCehakYVXmJ2/Un1FbilFrKmp9r9gZlAApzhpkCTyYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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