Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d93a20ff7c1c6c128d22efc043c712e68c85e3096dceb98d2ea595279fc056e' 
  AND token = 'UjJVVO9V8yQ2K5aYnlgXYjmvT0oNIgffXBxUoy5jhEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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