Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5e4b578f0dfa66fe56ba6212cb1a6dd38b20209d79e20e4e2dbcb3e09b82ff' 
  AND token = 'XKKbSzdxpgoKzCQwATJiFts409vfSFNe3HxrNLvqNqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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