Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3491f6e9cbf9c54fa277d14f6f650e50198dd97aa10ab75750e05b92ff6a68' 
  AND token = '3UrzzyNl6YB++rgsSFlS0ece+t3kNOWFgOxP4eSNFhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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