Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb21e77b9313631408ccfd4b54a3c0ddace6ed28d33ee283f2656dc6d517100' 
  AND token = 'LdRi8aqScs03Pn353sERf460HPYMgd3vvvvgby/KLIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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