Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3cb225a8ccf54b68b4a48986952c78cf84e5ae3aa9be57a02007c295e65526' 
  AND token = 'NgyiGTGf+YoEMBM7kL7UsYt4rHhIzZV2JHpvAIVtIz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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