Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3b954c2020c5fd1c44213363aa0e95eb49e65958daaa0f5c4fb058a9589c53' 
  AND token = '09FX2mz//nPR+MAuUf2cPF/4FxvJg3e79rW0ROLYGnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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