Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e553031a762181942a07dc95d9ffc746820be27e397413cd0abf6d89da3479' 
  AND token = 'ycGD8XJOwMiPsclBB7Q5g880hUR12rLPbwY1khN5z8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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