Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ef37829e9a233e54966bcc4cff6011f5bb67b6c6eb7d541e1d33a50da5908e' 
  AND token = 'kNvmnEZCZdwi6LWqasLmwUCXYIm3yEWEqr80zCQhK3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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