Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b8de7b17c07b806bec9190fff00a14a140956e54360b9c9af2851188246ff7' 
  AND token = 'fsXw6u3/sUGIX/nP2wc+Qr8i1Dwmb69HlJCjjyXtGSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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