Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f3d446e0d5c3468abe3d5a84946e9beeacc28ba9b5a73cbad53712059469b1' 
  AND token = 'MVgIJDf+XTH80m1PN/7SgHcx7KRgdhPFIxIXjSfa4Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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