Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc345b5b526d4309db051e3b6d89b7d65029f98c523336ee7a40860a364a801' 
  AND token = 'IkveuiAXy2fzxX95ifMwhDFyc62on1KmKteaphB+HKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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