Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39279e1b5598a91fab88361b86df85b812ca351a2923ba86dac85a9d392af9bb' 
  AND token = 'xmWBEpxuGKYfnTDKvG0iHkwV+FIykezYblr1aKqFUf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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