Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a4191e6d82740504789b04d49bd476e66ee7b03a30339bd3e69c5204736288' 
  AND token = 'bKPutzBiOgreUdetmktWqlG2Je+sBLm48XHu2/3TQi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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