Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8117ad821a3b6a8b1390ac9e92d09e73a999f69b2f1ffc0fdedbf01f409333bd' 
  AND token = 'fMsgPsHnbSGFnjGJEnV5n7mQQtO9K4ndNBLkV+EKZZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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